#include <func.h>

int main(int argc, char *argv[])
{
    ARGS_CHECK(argc, 3);

    // 1. 生成套接字描述符
    int sfd = socket(AF_INET, SOCK_STREAM, 0);

    
    struct sockaddr_in ser_addr; // 服务器信息结构体
    bzero(&ser_addr, sizeof(ser_addr));
    ser_addr.sin_family = AF_INET; // 使用IPv4
    ser_addr.sin_port = htons(atoi(argv[2])); // 端口号
    ser_addr.sin_addr.s_addr = inet_addr(argv[1]); // IP地址

    // 2. bind
    int ret = bind(sfd, (struct sockaddr *)&ser_addr, sizeof(ser_addr));
    ERROR_CHECK(ret, -1, "bind");

    // 3. listen
    ret = listen(sfd, 10);

    // 4. accept 进行三次握手
    struct sockaddr_in client_addr; // 客户端信息结构体
    bzero(&client_addr, sizeof(client_addr));
    int addr_len = sizeof(client_addr);
    // 实际用来和客户端通信的标识符
    int new_fd = accept(sfd, (struct sockaddr *)&client_addr, &addr_len);
    ERROR_CHECK(new_fd, -1, "accept");
    printf("client %s %d success connect\n", inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port));

    // 服务器先收
    char buf[128] = {0};
    recv(new_fd, buf, sizeof(buf), 0);
    printf("I am server, gets = %s\n", buf);

    // 服务器再发
    memset(buf, 0, sizeof(buf));
    strcpy(buf, "world");
    send(new_fd, buf, strlen(buf), 0);

    close(sfd);
    close(new_fd);
    return 0;
}